Strtok

This is a discussion on Strtok within the C Programming forums, part of the General Programming Boards category; can someone please show me an example of strtok i am reading in a string from a file and i ...

  1. #1
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    Strtok

    can someone please show me an example of strtok i am reading in a string from a file and i want to lets say take all the words that end in : and put them into a linked list for this application words ending in : are going to be deffintions so they will go into the st def; field of a node in a linked list that contains 3 fields per node
    here is my struct

    struct node{
    int ln;
    st id;
    st def;
    struct node* next;
    }

    Im just not quite sure how strtok would be used in this application
    thanks

  2. #2
    ATH0 quzah's Avatar
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    Why use strtok? Do you have to for this assignment? I've already told you how to fix this without using strtok. Anyway:

    char *tokiestring = "abc def ghi jkl mno pqr";
    char *c;

    c = strtok( tokiestring, " " );

    c will end up holding "abc".

    Again, I wouldn't use strtok in this application. There is no need for it, unless you're just using it to chop the first word off of a long string.

    And if you're going to do that, there are better functions anyway.

    Quzah.

  3. #3
    Registered User Engineer's Avatar
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    Cool Breaking string into tokens

    If you want to break a string of words that are all separated by ':' you could definitely use strtok(). It is not the safest function to use, and it does change the original string that you pass to it, but if you are pretty sure what kind of data you are parsing using strtok() go ahead.

    Here is what you would do:

    #define MY_DELIMITER ":"

    char MyString[] = { "abc:def:ghi:jkl:mnoqr" };

    char tokens[6][4];
    char *temp;

    temp_str = (char*)malloc(4);

    temp_str = strtok( MyString, MY_DELIMITER );
    strcpy(tokens[0], temp_str);
    printf("Token #1: %s\n", tokens[0]);

    for(int i=1; i < 6; i++) {
    temp_str = strtok( NULL, MY_DELIMITER );
    strcpy(tokens[i], temp_str);
    printf("Token #%d: %s\n", i+1, tokens[i]);
    }

    This will break the string into tokens defined by the delimiter and output all the tokens on the screen.
    1 rule of the Samurai Code: if you have nothing to say, don't say anything at all!

  4. #4
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    Talking Oooops

    Please ignore this line:

    temp_str = (char*)malloc(4);

    I put it there by mistake. Sorry
    1 rule of the Samurai Code: if you have nothing to say, don't say anything at all!

  5. #5
    ATH0 quzah's Avatar
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    Neat! What's the ansii characterfor the smiley face hehe...

    putc( );

    Quzah.

  6. #6
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    Talking Oooops

    Please ignore this line:

    temp_str = (char*)malloc(4);

    I put it there by mistake. Sorry

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